[MIPS][microMIPS] Fix PseudoMTLOHI_MM matching and expansion

On micromips MipsMTLOHI is always matched to PseudoMTLOHI_DSP regardless
of +dsp argument. This patch checks is HasDSP predicate is present for
PseudoMTLOHI_DSP so PseudoMTLOHI_MM can be matched when appropriate.

Add expansion of PseudoMTLOHI_MM instruction into a mtlo/mthi pair.

Patch by Mirko Brkusanin.

Differential Revision: http://reviews.llvm.org/D59203

llvm-svn: 356039

3 files changed, 69 insertions, 1 deletions

diff --git a/llvm/lib/Target/Mips/MipsDSPInstrInfo.td b/llvm/lib/Target/Mips/MipsDSPInstrInfo.td
index 3bc1fcfcb37..f21850c74ee 100644
--- a/llvm/lib/Target/Mips/MipsDSPInstrInfo.td
+++ b/llvm/lib/Target/Mips/MipsDSPInstrInfo.td
@@ -1313,7 +1313,9 @@ def PseudoCMPU_LE_QB : PseudoCMP<CMPU_LE_QB>;
 def PseudoPICK_PH : PseudoPICK<PICK_PH>;
 def PseudoPICK_QB : PseudoPICK<PICK_QB>;
 
-def PseudoMTLOHI_DSP : PseudoMTLOHI<ACC64DSP, GPR32>;
+let AdditionalPredicates = [HasDSP] in {
+  def PseudoMTLOHI_DSP : PseudoMTLOHI<ACC64DSP, GPR32>;
+}
 
 // Patterns.
 class DSPPat<dag pattern, dag result, Predicate pred = HasDSP> :
diff --git a/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp b/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp
index 1dde13f5416..cb31a9f9720 100644
--- a/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp
@@ -446,6 +446,9 @@ bool MipsSEInstrInfo::expandPostRAPseudo(MachineInstr &MI) const {
   case Mips::PseudoMTLOHI_DSP:
     expandPseudoMTLoHi(MBB, MI, Mips::MTLO_DSP, Mips::MTHI_DSP, true);
     break;
+  case Mips::PseudoMTLOHI_MM:
+    expandPseudoMTLoHi(MBB, MI, Mips::MTLO_MM, Mips::MTHI_MM, false);
+    break;
   case Mips::PseudoCVT_S_W:
     expandCvtFPInt(MBB, MI, Mips::CVT_S_W, Mips::MTC1, false);
     break;
diff --git a/llvm/test/CodeGen/Mips/micromips-pseudo-mtlohi-expand.ll b/llvm/test/CodeGen/Mips/micromips-pseudo-mtlohi-expand.ll
new file mode 100644
index 00000000000..b0b62e82619
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/micromips-pseudo-mtlohi-expand.ll
@@ -0,0 +1,63 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=mipsel-linux-gnu -mcpu=mips32r2 -mattr=+micromips -asm-show-inst < %s |\
+; RUN:   FileCheck %s -check-prefixes=MMR2
+; RUN: llc -mtriple=mipsel-linux-gnu -mcpu=mips32r2 -mattr=+dsp,+micromips -asm-show-inst < %s |\
+; RUN:   FileCheck %s -check-prefixes=MMR2-DSP
+
+define i64 @test(i32 signext %a, i32 signext %b) {
+; MMR2-LABEL: test:
+; MMR2:       # %bb.0: # %entry
+; MMR2-NEXT:    li16 $2, 0 # <MCInst #1700 LI16_MM
+; MMR2-NEXT:    # <MCOperand Reg:321>
+; MMR2-NEXT:    # <MCOperand Imm:0>>
+; MMR2-NEXT:    li16 $3, 1 # <MCInst #1700 LI16_MM
+; MMR2-NEXT:    # <MCOperand Reg:322>
+; MMR2-NEXT:    # <MCOperand Imm:1>>
+; MMR2-NEXT:    mtlo $3 # <MCInst #2008 MTLO_MM
+; MMR2-NEXT:    # <MCOperand Reg:322>>
+; MMR2-NEXT:    mthi $2 # <MCInst #2001 MTHI_MM
+; MMR2-NEXT:    # <MCOperand Reg:321>>
+; MMR2-NEXT:    madd $4, $5 # <MCInst #1774 MADD
+; MMR2-NEXT:    # <MCOperand Reg:22>
+; MMR2-NEXT:    # <MCOperand Reg:23>>
+; MMR2-NEXT:    mflo16 $2 # <MCInst #1860 MFLO16_MM
+; MMR2-NEXT:    # <MCOperand Reg:321>>
+; MMR2-NEXT:    mfhi16 $3 # <MCInst #1854 MFHI16_MM
+; MMR2-NEXT:    # <MCOperand Reg:322>>
+; MMR2-NEXT:    jrc $ra # <MCInst #1632 JRC16_MM
+; MMR2-NEXT:    # <MCOperand Reg:19>>
+;
+; MMR2-DSP-LABEL: test:
+; MMR2-DSP:       # %bb.0: # %entry
+; MMR2-DSP-NEXT:    li16 $2, 0 # <MCInst #1700 LI16_MM
+; MMR2-DSP-NEXT:    # <MCOperand Reg:321>
+; MMR2-DSP-NEXT:    # <MCOperand Imm:0>>
+; MMR2-DSP-NEXT:    li16 $3, 1 # <MCInst #1700 LI16_MM
+; MMR2-DSP-NEXT:    # <MCOperand Reg:322>
+; MMR2-DSP-NEXT:    # <MCOperand Imm:1>>
+; MMR2-DSP-NEXT:    mtlo $3, $ac0 # <MCInst #2006 MTLO_DSP
+; MMR2-DSP-NEXT:    # <MCOperand Reg:291>
+; MMR2-DSP-NEXT:    # <MCOperand Reg:322>>
+; MMR2-DSP-NEXT:    mthi $2, $ac0 # <MCInst #1999 MTHI_DSP
+; MMR2-DSP-NEXT:    # <MCOperand Reg:253>
+; MMR2-DSP-NEXT:    # <MCOperand Reg:321>>
+; MMR2-DSP-NEXT:    madd $ac0, $4, $5 # <MCInst #1792 MADD_DSP
+; MMR2-DSP-NEXT:    # <MCOperand Reg:26>
+; MMR2-DSP-NEXT:    # <MCOperand Reg:22>
+; MMR2-DSP-NEXT:    # <MCOperand Reg:23>
+; MMR2-DSP-NEXT:    # <MCOperand Reg:26>>
+; MMR2-DSP-NEXT:    mflo $2, $ac0 # <MCInst #1862 MFLO_DSP
+; MMR2-DSP-NEXT:    # <MCOperand Reg:321>
+; MMR2-DSP-NEXT:    # <MCOperand Reg:26>>
+; MMR2-DSP-NEXT:    jr $ra # <MCInst #1639 JR_MM
+; MMR2-DSP-NEXT:    # <MCOperand Reg:19>>
+; MMR2-DSP-NEXT:    mfhi $3, $ac0 # <MCInst #1856 MFHI_DSP
+; MMR2-DSP-NEXT:    # <MCOperand Reg:322>
+; MMR2-DSP-NEXT:    # <MCOperand Reg:26>>
+entry:
+  %conv = sext i32 %a to i64
+  %conv1 = sext i32 %b to i64
+  %mul = mul nsw i64 %conv, %conv1
+  %add = add nsw i64 %mul, 1
+  ret i64 %add
+}